org.jetbrains.kotlin.types.AbstractClassTypeConstructor Maven / Gradle / Ivy
/*
* Copyright 2010-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.types;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.kotlin.builtins.KotlinBuiltIns;
import org.jetbrains.kotlin.descriptors.*;
import org.jetbrains.kotlin.resolve.DescriptorUtils;
import org.jetbrains.kotlin.resolve.descriptorUtil.DescriptorUtilsKt;
import org.jetbrains.kotlin.storage.StorageManager;
import org.jetbrains.kotlin.utils.SmartList;
import java.util.Collection;
import java.util.Collections;
public abstract class AbstractClassTypeConstructor extends AbstractTypeConstructor implements TypeConstructor {
private int hashCode = 0;
public AbstractClassTypeConstructor(@NotNull StorageManager storageManager) {
super(storageManager);
}
@Override
public final int hashCode() {
int currentHashCode = hashCode;
if (currentHashCode != 0) return currentHashCode;
ClassifierDescriptor descriptor = getDeclarationDescriptor();
if (hasMeaningfulFqName(descriptor)) {
currentHashCode = DescriptorUtils.getFqName(descriptor).hashCode();
}
else {
currentHashCode = System.identityHashCode(this);
}
hashCode = currentHashCode;
return currentHashCode;
}
@NotNull
@Override
public abstract ClassDescriptor getDeclarationDescriptor();
@Override
public final boolean isFinal() {
ClassDescriptor descriptor = getDeclarationDescriptor();
return ModalityUtilsKt.isFinalClass(descriptor) && !descriptor.isExpect();
}
@NotNull
@Override
public KotlinBuiltIns getBuiltIns() {
return DescriptorUtilsKt.getBuiltIns(getDeclarationDescriptor());
}
@Override
public final boolean equals(Object other) {
if (this == other) return true;
if (!(other instanceof TypeConstructor)) return false;
// performance optimization: getFqName is slow method
if (other.hashCode() != hashCode()) return false;
// Sometimes we can get two classes from different modules with different counts of type parameters.
// To avoid problems in type checker we suppose that it is different type constructors.
if (((TypeConstructor) other).getParameters().size() != getParameters().size()) return false;
ClassifierDescriptor myDescriptor = getDeclarationDescriptor();
ClassifierDescriptor otherDescriptor = ((TypeConstructor) other).getDeclarationDescriptor();
if (!hasMeaningfulFqName(myDescriptor) ||
otherDescriptor != null && !hasMeaningfulFqName(otherDescriptor)) {
// All error types and local classes have the same descriptor,
// but we've already checked identity equality in the beginning of the method
return false;
}
if (otherDescriptor instanceof ClassDescriptor) {
return areFqNamesEqual(((ClassDescriptor) myDescriptor), ((ClassDescriptor) otherDescriptor));
}
return false;
}
private static boolean areFqNamesEqual(ClassDescriptor first, ClassDescriptor second) {
if (!first.getName().equals(second.getName())) return false;
DeclarationDescriptor a = first.getContainingDeclaration();
DeclarationDescriptor b = second.getContainingDeclaration();
while (a != null && b != null) {
if (a instanceof ModuleDescriptor) return b instanceof ModuleDescriptor;
if (b instanceof ModuleDescriptor) return false;
if (a instanceof PackageFragmentDescriptor) {
return b instanceof PackageFragmentDescriptor &&
((PackageFragmentDescriptor) a).getFqName().equals(((PackageFragmentDescriptor) b).getFqName());
}
if (b instanceof PackageFragmentDescriptor) return false;
if (!a.getName().equals(b.getName())) return false;
a = a.getContainingDeclaration();
b = b.getContainingDeclaration();
}
return true;
}
private static boolean hasMeaningfulFqName(@NotNull ClassifierDescriptor descriptor) {
return !ErrorUtils.isError(descriptor) &&
!DescriptorUtils.isLocal(descriptor);
}
@NotNull
@Override
protected Collection getAdditionalNeighboursInSupertypeGraph(boolean useCompanions) {
DeclarationDescriptor containingDeclaration = getDeclarationDescriptor().getContainingDeclaration();
if (!(containingDeclaration instanceof ClassDescriptor)) {
return Collections.emptyList();
}
Collection additionalNeighbours = new SmartList();
// We suppose that there is an edge from C to A in graph when disconnecting loops in supertypes,
// because such cyclic declarations should be prohibited (see p.10.2.1 of Kotlin spec)
// class A : B {
// static class C {}
// }
// class B : A.C {}
ClassDescriptor containingClassDescriptor = (ClassDescriptor) containingDeclaration;
additionalNeighbours.add(containingClassDescriptor.getDefaultType());
// Also we add edge from host-class to companion object. Together with previous edges
// (from nesteds to containing class), they can create visibility loops like in the
// following example:
//
// class ContainingClass {
// open class Nested {} // to create scope for resolving Nested, we have to resolve CO header
// companion object : Nested() {} // to resolve CO header, we have to resolve Nested
// }
//
// Relates to KT-21515
ClassDescriptor companion = containingClassDescriptor.getCompanionObjectDescriptor();
if (useCompanions && companion != null) {
additionalNeighbours.add(companion.getDefaultType());
}
return additionalNeighbours;
}
@Nullable
@Override
protected KotlinType defaultSupertypeIfEmpty() {
if (KotlinBuiltIns.isSpecialClassWithNoSupertypes(this.getDeclarationDescriptor())) {
return null;
} else {
return getBuiltIns().getAnyType();
}
}
}